diff --git a/src/frequenz/client/dispatch/types.py b/src/frequenz/client/dispatch/types.py
index 031a27d..c9ab30d 100644
--- a/src/frequenz/client/dispatch/types.py
+++ b/src/frequenz/client/dispatch/types.py
@@ -357,7 +357,7 @@ def to_protobuf(self) -> PBDispatch:
                 is_active=self.active,
                 is_dry_run=self.dry_run,
                 payload=payload,
-                recurrence=self.recurrence.to_protobuf(),
+                recurrence=self.recurrence.to_protobuf() if self.recurrence else None,
             ),
         )